JP2019217963A - Air bag grid reinforcement member, mold assembly for manufacturing the same, and manufacturing method - Google Patents

Abstract

To make, mainly, a shape of a facing portion of a leg part and a door part stable.SOLUTION: An air bag grid reinforcement member 31 includes at least a door part 32 and a leg part 34 positioned outside of the door pat 32, and a space between facing portions of the door part 32 and the leg part 34 is connected by embedding a hinge member 54 formed of a separate member. In the facing portion of the leg part 34 to the door part 32, a projection part 142 projecting to the side of the door part 32 rather than an upper surface 141 of the leg part 34 is formed. A root part 54a of the hinge member 54 to the leg part 34 is embedded so as to be exposed to the surface layer of the projection part 142. At a position outside of the projection part 142 on the upper surface 141 of the leg part 34, a recess 143 is formed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an airbag lid reinforcing member, a mold device for manufacturing the same, and a manufacturing method.

  BACKGROUND ART Vehicles such as automobiles are provided with an airbag device as an emergency safety means. For example, an airbag device for a passenger seat includes an airbag module that folds and accommodates a bag-shaped airbag body, a lid member, and an airbag grid reinforcing member (for example, see Patent Document 1).

  The lid member normally covers the airbag module from above and forms an opening for inflating the airbag body deployed from the airbag module into the vehicle compartment in an emergency. The airbag lid reinforcing member is attached to the rear surface side of the lid member to reinforce the lid member, accommodates at least a part of the airbag module, and guides the airbag body deployed from the airbag module to the lid member.

  The lid member has a lid portion opened by the airbag body, and a lid outer peripheral portion surrounding the outer periphery of the lid portion.

  The airbag lid reinforcing member has a door, a flange, a hinge, and a leg. The door portion is attached to the back surface of the lid portion to reinforce the lid portion, and can be opened and closed integrally with the lid portion. The flange portion surrounds the outer periphery of the door portion and is attached to the back surface of the outer periphery of the lid to reinforce the outer periphery of the lid. The hinge portion is arranged at a position inside the leg portion, and connects the door portion to the flange portion so as to be able to open and close. The leg is disposed below the flange and the door while surrounding the upper part of the airbag module.

  As the above-mentioned hinge portion, there is a hinge portion formed by a hinge member formed of another member.

JP 2017-140951 A

  However, the air bag grid reinforcing member described in Patent Document 1 has the following problems. That is, when a hinge member formed of a separate member is used for the hinge portion, for example, the hinge member is embedded inside the airbag lid reinforcing member by insert molding, but the portion of the leg portion facing the door portion is used. It was difficult to stabilize the shape.

  Therefore, an object of the present invention is mainly to solve the above-mentioned problems.

In order to solve the above problems, the present invention provides
At least a door portion and a leg portion located outside the door portion,
In the airbag lid reinforcing member connected between the opposed portions of the door portion and the leg portion by embedding a hinge member formed of a separate member,
A protrusion is formed on the portion of the leg facing the door, the protrusion protruding from the upper surface of the leg toward the door.
A root portion of the hinge member with respect to the leg portion is buried in a state of being exposed on a surface layer of the protrusion,
A concave portion is formed on the upper surface of the leg portion at a position outside the projecting portion.

  According to the present invention, the shape of the portion of the leg portion facing the door portion can be stabilized by the above configuration.

It is a longitudinal section of an airbag device concerning this embodiment. FIG. 2 is an enlarged view of an upper peripheral portion of a leg in the airbag lid reinforcing member of FIG. 1. FIG. 4 is a partially enlarged view showing a modification of FIG. 2. FIG. 4 is an overall perspective view of an airbag lid reinforcing member. It is the elements on larger scale of FIG. It is a longitudinal section of a mold device for manufacture of an airbag lid reinforcing member. FIG. 7 is a partially enlarged view of the vicinity of the upper part of a leg of the manufacturing mold apparatus of FIG. 6. It is the elements on larger scale of FIG. FIG. 9 is a partially enlarged view similar to FIG. 8 according to a comparative example. FIG. 10 is a partially enlarged view showing the airbag lid reinforcing member manufactured according to FIG. 9.

Hereinafter, the present embodiment will be described in detail with reference to the drawings.
1 to 10 are for explaining this embodiment.

  <Structure> The structure of this embodiment will be described below.

  FIG. 1 shows an airbag device. The directions in the figure are a vehicle front-rear direction X, a vehicle width direction Y, and a vertical direction Z.

  A vehicle 1 such as an automobile is provided with an airbag device 3 in a vehicle compartment 2 as an emergency safety means. For example, the airbag device 3 for a passenger seat includes an airbag module 5 that folds and accommodates a bag-shaped airbag body 4, a lid member 6, and an airbag lid reinforcing member 31.

  The lid member 6 normally covers the airbag module 5 from above and forms an opening for inflating the airbag body 4 deployed from the airbag module 5 into the vehicle compartment 2 in an emergency. The lid member 6 has a lid portion 21 opened by the airbag body 4 and a lid outer peripheral portion 22 surrounding the outer periphery of the lid portion 21.

  In this embodiment, two lid portions 21 are provided in the vehicle front-rear direction X. The lid portion 21 and the lid outer peripheral portion 22 are defined by a cleavage line 23. The cleavage line 23 is formed as a cut formed on the rear surface side of the lid member 6 to a depth that does not reach the surface of the lid member 6. The lid member 6 includes a member integrated with the instrument panel 8 and a member separate from the instrument panel 8.

  The airbag lid reinforcing member 31 is attached to the back side of the lid member 6 to reinforce the lid member 6, accommodates at least a part of the airbag module 5, and removes the airbag body 4 deployed from the airbag module 5. Guide to the lid member 6.

  The airbag lid reinforcing member 31 has a door portion 32, a flange portion 33, a leg portion 34, and a hinge portion 35. Among these, the door part 32 is attached to the back surface of each lid part 21 to reinforce each lid part 21 and can be opened and closed integrally with the lid part 21.

  The flange portion 33 surrounds the outer periphery of the door portion 32 and is attached to the back surface of the lid outer peripheral portion 22 to reinforce the lid outer peripheral portion 22. Welding ribs 36 and 37 for welding to the lid member 6 are provided on the surfaces of the door 32 and the flange 33.

  The leg portion 34 is disposed below the door portion 32 and the flange portion 33 in a state surrounding the upper portion of the airbag module 5. The upper portion of the airbag module 5 is inserted into the leg portion 34 from below, and the leg portion 34 guides the deployed airbag body 4 toward the door portion 32 and the lid portion 21. Functions as a unit. For this purpose, the leg portion 34 is formed in a substantially frame-like shape that surrounds the position outside the door portion 32 and the outer peripheral side of the door portion 32 and extends in the direction of bulging into the vehicle compartment 2 (upward diagonally rearward). .

  Hook portions 42 are provided on the front and rear side surfaces of the upper portion of the airbag module 5, and locking holes 43 in which the hook portions 42 can be loosely fitted are formed in the leg portions 34. The lower portion of the airbag module 5 is fixed to a vehicle body strength member 44 such as a steering support member provided on the vehicle body using brackets 45 and 46.

  The hinge portion 35 connects the door portion 32 to the flange portion 33 so as to be openable and closable. The hinge portion 35 has a surplus portion 52 that becomes a center of rotation of the door portion 32. The extra length part 52 is installed at a position between the door part 32 and the leg part 34 so as to detour downward. The extra length 52 is substantially U-shaped or substantially V-shaped in a side view. As the hinge portion 35, there is one using a hinge member 54 formed as a separate member (separate hinge). As the hinge member 54, a flexible resin net or film, a metal plate such as an iron plate, or the like can be used. In this embodiment, a resin net is used for the hinge member 54. The hinge member 54 is embedded between the door 32 and the leg 34 and the flange 33 by insert molding.

  In contrast to the above basic configuration, this embodiment is provided with the following configuration.

<About the air back grid reinforcement member 31>
The airbag lid reinforcing member 31 of this embodiment has at least a door portion 32 and a leg portion 34 located outside the door portion 32, and a portion between the facing portion of the door portion 32 and the leg portion 34 is a separate member. It is connected by embedding the constructed hinge member 54.

  Here, the opposing portions of the door portion 32 and the leg portion 34 refer to an outer portion of the door portion 32 near the leg portion 34 and an inner portion (upper portion) of the leg portion 34 near the door portion 32. It is.

(1) As shown in FIG. 2, a protruding portion 142 protruding from the upper surface 141 of the leg portion 34 toward the door portion 32 is formed at a portion of the leg portion 34 facing the door portion 32.
Then, the base 54 a of the hinge member 54 with respect to the leg 34 is buried in a state of being exposed on the surface layer of the protrusion 142.
In addition, a concave portion 143 is formed on the upper surface 141 of the leg portion 34 at a position outside the projecting portion 142.

  Here, the upper surface 141 of the leg portion 34 is formed at a position equal to or higher than the upper surface 33 a of the flange portion 33. In this embodiment, the upper surface 141 of the leg portion 34 is formed higher than the upper surface 33 a of the flange portion 33 and lower than the rear surface of the lid member 6. The height is not the height in the vertical direction Z but the height in a direction perpendicular to the curved surface formed by the lid member 6.

  The protrusion 142 is a portion that protrudes laterally from the inner surface of the leg 34. The protruding portion 142 is lower than the upper surface 141 of the leg portion 34 and protrudes laterally from a position substantially equal to or lower than the upper surface 33a (or the lower surface 33b) of the flange portion 33. The protruding portion 142 may be formed at a position slightly lower than the upper surface 141 on the inner surface side of the leg portion 34, for example, by making the leg portion 34 thicker than an existing one. May be formed so that a corner portion on the side of the door portion 32 on the upper side is cut out like a step (a cut portion 133).

  When the projections 142 are formed by making the leg portions 34 thick, the entire inner surface of the leg portions 34 except for the portion (upper portion) on the upper surface 141 side may be made thicker, or the upper surface 141 of the leg portions 34 may be made thicker. Only a position slightly lower than the side portion (upper portion) may be partially thickened. Further, the protruding portion 142 may be formed by combining the above-described thick portion and the step-shaped notch 133 at the upper portion of the inner surface of the leg portion 34. The protrusion 142 has a uniform shape in the vehicle width direction Y.

  In this embodiment, the upper portion of the protrusion 142 has a recess 131 (first recess) that is recessed downward. The concave portion 131 has an inclined surface 132 on the inner wall surface of the leg portion 34 on the door portion 32 side, which is inclined upward toward the door portion 32 (or downward toward the flange portion 33). The bottom of the recess 131 is lower than the lower surface 33 b of the flange 33.

  The hinge member 54 has a portion inside the flange 33 buried along the lower surface 33 b of the flange 33. In addition, a holding rib 33c for holding the hinge member 54 in an embedded state may be appropriately formed on the lower surface 33b of the flange portion 33.

  In FIG. 2, the hinge member 54 is embedded such that the portion inside the leg 34 is inclined downward from the position of the lower surface 33 b of the flange 33 toward the protrusion 142.

  The base portion 54a of the hinge member 54 is a portion serving as an end of the extra length portion 52 of the hinge member 54, and is a portion where the hinge member 54 projects from the leg portion 34 toward the extra length portion 52.

  In the protrusion 142, the base 54 a of the hinge member 54 is disposed along the upper part of the protrusion 142, and the lower part in the thickness direction is embedded in the upper part of the protrusion 142. Further, the upper part in the thickness direction of the base part 54a is exposed without being buried in the upper part of the protruding part 142.

  The concave portion 143 (second concave portion) on the upper surface 141 of the leg portion 34 is provided to control the flow of the molten resin 136 during insert molding (resin flow control concave portion, FIG. 8). The concave portion 143 is provided singly or plurally when viewed from the side (the vehicle width direction Y) (in the present embodiment, the concave portion is singular). The recess 143 extends continuously or discontinuously in the vehicle width direction Y along the hinge member 54. The recess 143 may be formed to a depth that allows the flow of the molten resin 136 to be controlled. Although a certain effect can be obtained even if the recess 143 is formed to be shallower, it is preferably as follows.

  (2) The concave portion 143 may have a bottom portion 143a that reaches the burying depth of the hinge member 54 with respect to the leg portion 34.

  Here, as shown in FIG. 2, the concave portion 143 is provided at both ends of the portion of the hinge member 54 inside the leg portion 34 (the position of the lower surface 33 b of the flange portion 33 and the position of the bottom of the concave portion 131 of the protrusion 142). The position of the bottom 143a is set on a line that is almost straight. Alternatively, as shown in FIG. 3, the position of the bottom portion 143a may be set to be lower than the line connecting both ends described above. Thus, the bottom 143 a of the recess 143 reaches the depth at which the hinge member 54 is embedded.

  (3) At this time, as shown in the modification of FIG. 3, the embedded angle 144 of the hinge member 54 with respect to the leg 34 may be an obtuse angle.

  Here, the embedding angle 144 is such that the embedding portion that is closer to the flange portion 33 than the base portion 54 a of the hinge member 54 and the vertical notch portion 133 that forms a step-shaped notch 133 that goes from the upper surface 141 of the leg portion 34 to the protruding portion 142. It is the angle formed by the surface.

  The embedding angle 144 may be a right angle structurally or an acute angle as shown in FIG.

  (4) As shown in the modification of FIG. 3, the hinge member 54 embedded in the leg 34 may be bent downward so that the position of the bottom 143 a of the recess 143 is the lowest point.

  Here, the concave portion 143 is provided at a substantially central portion of the portion embedded in the leg portion 34 of the hinge member 54 in the vehicle front-rear direction X. The concave portion 143 has the bottom 143a at the lowest point by lowering the position of the bottom 143a than the position of both ends of the portion inside the leg 34 of the hinge member 54. As a result, the hinge member 54 is bent in a shallow V-shape inside (substantially at the center) of the leg 34.

(5) As shown in FIG. 5 (also see FIG. 4), the recess 143 may be provided discontinuously in the width direction of the leg portion 34 (the vehicle width direction Y).
A bridge 145 reaching the upper surface 141 of the leg 34 may be formed between the recesses 143.

  Here, a plurality of recesses 143 are formed in the vehicle width direction Y. The bridge portions 145 are partition walls that partition between the plurality of concave portions 143, and are formed in plural at a required interval in the vehicle width direction Y. The bridge portion 145 serves as a partition wall between the plurality of recesses 143 by connecting between (in front and behind) inner surfaces of the recesses 143.

  It is preferable that the bridge portion 145 extends to the height of the upper surface 141 of the leg portion 34 and is formed at substantially the same height as the upper surface of the leg portion 34. However, the bridge portion 145 may be slightly higher or slightly lower. May be. The limit of the height of the bridge portion 145 is until it reaches the rear surface of the lid member 6.

  (6) As shown in FIG. 2, the concave portion 143 is located at a position 146 between the inner surface of the leg portion 34 and the welding rib 37 (37a) closest to the door portion 32 formed on the upper surface 141 side of the leg portion 34. It may be formed.

  Here, the inner surface of the leg portion 34 is a vertical surface of the step-shaped notch 133 in a surface (inner wall surface) of the leg portion 34 on the door portion 32 side or an upper portion of the surface of the leg portion 34 on the door portion 32 side. .

  The upper surface 141 side of the leg portion 34 is a portion including the upper surface 141 of the leg portion 34 and the upper surface 33a of the flange portion 33 widely. The welding rib 37 (37a) closest to the door portion 32 is provided slightly closer to the flange portion 33 than the boundary between the leg portion 34 and the flange portion 33.

  At this time, by providing the concave portion 143 close to the door portion 32, the shape of the protruding portion 142 can be easily obtained. Conversely, by providing the recess 143 away from the door 32, the strength around the protrusion 142 can be improved (see the position of the protrusion 148 indicated by the phantom line in FIG. 8). The position of the concave portion 143 is determined optimally in consideration of the balance between the two.

<About the mold apparatus 101 for manufacturing the air back grid reinforcing member 31>
The mold apparatus 101 for manufacturing the airbag lid reinforcing member 31 is as shown in FIG. As shown in FIG. 1 (FIG. 4), the manufacturing mold apparatus 101 has at least a door 32 and a leg 34 located outside the door 32, and the door 32 and the leg 34. A molding space 102 for manufacturing the airbag lid reinforcing member 31 which is connected by embedding the hinge member 54 formed of a separate member is provided between the opposed portions. The molding space 102 is formed inside upper and lower dies 103 and 104.

Then, as shown in FIG. 7 (see also FIG. 2), a protruding portion 142 protruding toward the door portion 32 from the upper surface 141 of the leg portion 34 is formed on a portion of the leg portion 34 facing the door portion 32. At the same time, the hinge member 54 has a protruding portion forming portion 147 for burying the base portion 54a of the hinge member 54 with respect to the leg portion 34 in a state of being exposed on the surface layer of the protruding portion 142.
In addition, a protrusion 148 (a protrusion for forming a recess) for forming a recess 143 is provided on the upper surface 141 of the leg 34 at a position outside the protrusion 142.

  Here, the protruding portion forming portion 147 can be formed by, for example, expanding the portion of the lower mold 103 on the inner surface side of the leg portion 34 entirely or partially than the existing one.

  The protrusion 148 is formed on the upper mold 104. Preferably, the protrusion 148 is for forming a recess 143 having a bottom 143 a that reaches the depth at which the hinge member 54 is embedded in the leg 34. The position and length of the protrusion 148 are set according to the embedment angle 144 of the hinge member 54 with respect to the leg 34, the position of the lowest point of the hinge member 54, and the like. Further, cutouts for forming the bridge portions 145 are formed in the protrusions 148 at intervals in the vehicle width direction Y.

  In addition to the above, the molds 103 and 104 are provided with an extra-length portion forming projection 105 for forming the extra-length portion 52 on the hinge member 54 and an extra-length portion forming concave portion 109 (excess length). Part forming part).

  On the upper mold 104, a protrusion 135 for forming the concave portion 131 is formed above the protrusion 142. The protrusion 135 is provided below the notch-forming projection 138 for forming the step-shaped notch 133.

  Then, a sandwiching portion 110 for vertically sandwiching and fixing the hinge member 54 is formed between the extra length forming portions of the molds 103 and 104 and the protrusion 135. The holding portion 110 is located at a position higher than the tip of the protrusion 135.

  Further, a gate 137 for injecting the molten resin 136 into the molding space 102 is provided at the position of the flange 33. The gate portion 137 is provided at a position outside the welding rib 37a closest to the door portion 32 as shown in FIG.

  Further, a locate pin 107 for inserting a locate hole 108 formed in the hinge member 54 is appropriately provided inside the molding space 102.

  Further, as shown in FIG. 6, a partition portion 111 that partitions between the plurality of door portions 32 is provided inside the molding space 102. In addition, the hinge member 54 can be set inside the molding space 102 for each door portion 32. For example, one hinge member 54 is set inside the molds 103 and 104, and a plurality of hinge members 54 are set. It can also be cut at the time of mold clamping in accordance with the door portion 32. In this case, the cutting section 106 may be provided at the position of the partition section 111.

<About the manufacturing method of the airbag lid reinforcing member 31>
The method of manufacturing the airbag lid reinforcing member 31 includes at least the door portion 32 and the leg portion 34 located outside the door portion 32, and the portion between the door portion 32 and the leg portion 34 facing each other is formed by a separate member. The airbag lid reinforcing member 31 connected by embedding the hinge member 54 thus formed is manufactured.

A protrusion 142 is formed on the opposing portion of the leg 34 so as to protrude toward the door 32 from the upper surface 141 of the leg 34, and the root 54 a of the hinge member 54 with respect to the leg 34 is formed as a protrusion 142. Buried in a state of being exposed on the surface layer.
Further, a concave portion 143 is formed on the upper surface 141 of the leg portion 34 at a position outside the projecting portion 142.

  Here, the projecting portion 142 is formed by a projecting portion forming portion 147 provided in the molding space 102 of the molds 103 and 104. The recess 143 is formed by the protrusion 148. Preferably, the recess 143 has a bottom 143 a that reaches the depth of the embedment of the hinge member 54 with respect to the leg 34.

  The air bag grid reinforcing member 31 is formed by a process of setting the hinge member 54 inside the opened molds 103 and 104 (setting process), a process of clamping the molds 103 and 104 (mold clamping process), and a molding process. By performing an injection molding step of injecting the molten resin 136 into the space 102 and a demolding step of releasing the air back grid reinforcing member 31 from the molds 103 and 104 after the molten resin 136 in the molding space 102 has hardened to some extent. Manufactured.

  At the time of the setting step, the hinge member 54 is set on the lower mold 103 in a state where the locating hole 108 is fitted to the locating pin 107. As shown in FIG. 7, a portion of the lower mold 103 inside the leg 34 is a molding space 102, and therefore, if there is no member defining the shape of the hinge member 54 in the leg 34, the hinge There is a possibility that a portion of the member 54 inside the leg 34 may be sagged.

  Therefore, a protrusion 135 is provided on the upper mold 104, and when the upper mold 104 is placed on the lower mold 103 in the mold clamping step, the portion in the leg 34 is formed by the protrusion 135. The shape of the hinge member 54 is defined by bending the hinge member 54 from above. As a result, the base portion 54a of the hinge member 54 has a shape along the protrusion 135.

  At this time, the portion of the hinge member 54 closer to the door portion 32 (inside) than the projection 135 is sandwiched and fixed vertically by the sandwiching portion 110 at a position higher than the tip of the projection 135, Never move.

  Further, the portion inside the flange portion 33 of the hinge member 54 is restrained by using the locate pin 107 in a state where the portion is set on the lower mold 103 whose position is higher than the tip portion of the protrusion 135, It is difficult to move.

  Therefore, when the hinge member 54 is pressed from above by the projection 135, the root 54 a is bent to apply tension to the portion inside the leg 34, and the root 54 a is clamped by the projection 135. It is held in a state of being in close contact with the surface on the 110 side.

  In the injection molding step, the molten resin 136 is injected from the gate 137 into the molding space 102. At this time, as described above, since the shape of the hinge member 54 is defined in a state where the portion in the leg 34 is tensioned, the hinge member 54 can withstand the resin pressure of the molten resin 136. As a result, the hinge member 54 is buried in the leg portion 34 with the above-described shape, and the root portion 54a in the concave portion 131 is buried only in the lower portion in a shape conforming to the shape of the contact portion with the protrusion 135. Is done.

  Further, as shown in FIG. 8, the protrusion 148 provided on the mold 104 controls the resin flow direction around the upper portion of the leg 34 so as to bypass the protrusion 148.

  As a result, the detoured molten resin 136 causes the hinge member 54 (for example, a resin net) to float, thereby preventing displacement and deformation of the hinge member 54 due to resin pressure, and the air bag grid reinforcing member 31 is described above. It is possible to form the shape correctly. Further, the molten resin 136 is prevented from entering between the base portion 54 a of the hinge member 54 and the protrusion 135 for forming the recess 131.

  <Operation> The operation of this embodiment will be described below.

  When the airbag body 4 is deployed and exits the airbag module 5 in an emergency, the airbag body 4 is guided along the legs 34 while inflating and pushes the door 32 and the lid 21 from below. The tearing line 23 is torn by the pressing force of the airbag body 4, the door 32 and the lid 21 are opened centering on the hinge 35, and an opening is formed in the lid member 6. The airbag body 4 protrudes from the opening toward the occupant in the passenger compartment 2 to protect and restrain the upper body of the occupant properly seated on the seat.

  <Effects> According to this embodiment, the following effects can be obtained.

  (Effect 1) A protrusion 142 is provided in a portion of the leg 34 facing the door 32, and the protrusion 34 is embedded in the protrusion 142 such that the base 54 a of the hinge member 54 is exposed on the surface layer of the protrusion 142. Accordingly, when the door portion 32 and the lid portion are opened, the root portion 54a of the hinge member 54 buried so as to be exposed on the surface layer of the protrusion 142 is rotated while peeling off from the surface layer of the protrusion 142. Therefore, the force applied to the base portion 54a of the hinge member 54 at the time of opening can be dispersed by utilizing the peeling of the hinge member 54.

  Then, a concave portion 143 was formed on the upper surface 141 of the leg portion 34 at a position outside the projecting portion 142. Thus, when the hinge member 54 is insert-molded, as shown in FIG. 8, the resin flow direction around the upper portion of the leg 34 is reduced by the protrusion 148 for forming the concave portion 143 provided in the mold 104. It is controlled so as to bypass the protrusion 148.

  Therefore, the molten resin 136 bypassing the protrusion 148 causes the hinge member 54 to float, thereby preventing displacement and deformation of the hinge member 54 due to resin pressure, and correctly forming the airbag lid reinforcing member 31 into the above-described shape. It becomes possible. Further, it is possible to prevent the molten resin 136 from entering between the base portion 54 a of the hinge member 54 and the protrusion 135 for forming the concave portion 131 of the protrusion 142.

  Therefore, the base portion 54a of the hinge member 54 is clearly exposed on the surface layer of the protrusion 142, and the hinge member 54 can be insert-molded in a state where the shape of the protrusion 142 is stable. Since the shape of the portion facing the portion 32 is stabilized, the projecting portion 142 has a desired shape in which the hinge member 54 is not easily cut and the resin of the projecting portion 142 is not easily damaged when the airbag body 4 inflates. Can be.

  (Effect 2) The concave portion 143 may have a bottom portion 143a that reaches the burying depth of the hinge member 54 with respect to the leg portion 34. Accordingly, when the hinge member 54 is insert-molded, the intermediate portion of the portion in the leg 34 of the hinge member 54 raised by the molten resin 136 bypassing the projection 148 for forming the concave portion 143 is formed as a projection. By being stopped or pressed by the tip of the projection 148 when hitting the tip of the part 148, the tip of the projection 148 does not rise above the position of the tip of the projection 148 (the desired burying depth of the hinge member 54). Therefore, the protruding portion 142 can be surely finished to a desired shape in which the breakage of the hinge member 54 and the breakage of the resin of the protruding portion 142 hardly occur when the airbag body 4 inflates.

  (Effect 3) The embedding angle 144 of the hinge member 54 with respect to the leg 34 may be obtuse. As a result, the upper portion of the leg portion 34 in which the hinge member 54 is embedded (embedded portion) becomes sufficiently thick, or the thin portion does not exist above the embedded portion. Even when a large pressing force from the airbag body acts on the hinge member 54 when the portion 21 and the door portion 32 are opened, it is possible to prevent the upper portion of the leg portion 34 from being damaged.

  (Effect 4) The hinge member 54 embedded in the leg 34 may be bent downward so that the position of the bottom 143a of the concave portion 143 is the lowest point. Accordingly, in addition to (Effect 3), the concave portion 143 (rather than the concave portion 131 (first concave portion)) is provided at a substantially central portion of the portion embedded in the leg portion 34 of the hinge member 54 in the vehicle longitudinal direction X. Since insert molding is performed in a state where a large tension is applied, the embedded shape of the hinge member 54 with respect to the leg portion 34 is more stable, which is further advantageous against resin breakage of the protruding portion 142 when the airbag body expands. Become.

  (Effect 5) A bridge portion 145 reaching the upper surface 141 of the leg portion 34 may be interposed between the plurality of concave portions 143 formed discontinuously. Thus, the rigidity of the upper surface 141 of the leg portion 34 is increased by the bridge portion 145, which is advantageous against breakage of the hinge member 54 and damage to the resin of the protruding portion 142 when the airbag body expands.

  (Effect 6) The concave portion 143 may be formed at a position between the inner surface of the leg portion 34 and the welding rib formed on the upper surface 141 side of the leg portion 34 and closest to the door portion 32. It is possible to achieve both the formation of the protrusion 142 in a shape in which the hinge member 54 is not easily cut or the resin of the protrusion 142 is damaged, and the strength of the portion of the leg 34 facing the door 32 is ensured. .

  (Effect 7) The protrusions 148 may be provided on the molds 103 and 104 (the mold 104 in this embodiment) of the manufacturing mold apparatus 101. Accordingly, when the hinge member 54 is inserted into the molding space 102 to mold the airbag lid reinforcing member 31, as shown in FIG. 8, the resin flow direction can be detoured by the protrusion 148. Therefore, the resin flow direction can be controlled so that the base 54 a of the hinge member 54 rises to the surface layer of the protrusion 142 at the protrusion 142, and the hinge member 54 is displaced downward in the manufacturing mold apparatus 101. Can be suppressed. Therefore, the shape of the portion (projection 142) of the leg 34 facing the door portion 32 and the shape of the portion of the hinge member 54 inside the leg 34 can be stabilized.

  On the other hand, in the case of the comparative example shown in FIGS. 9 and 10, since the resin flow direction cannot be controlled because the protrusion 148 is not provided, the hinge member 54 is not moved by the resin pressure of the molten resin 136. There is a possibility that the protrusion 142 is displaced downward. This makes it easy to form an extra resin layer 149 above the protrusions 142 and above the roots 54a. When the extra resin layer 149 is formed above the root portion 54a in this manner, the upper portion of the root portion 54a is covered with the extra resin layer 149 and is not exposed, so that the airbag body 4 is inflated. At the time of ejection, there is a possibility that the hinge member 54 may be cut by the extra resin layer 149, or the protrusion 142 may be damaged by resin.

  In the case of this embodiment, the structure is such that the extra resin layer 149 is hardly formed by the protrusion 148, so that when the airbag body 4 expands, the hinge member 54 is cut or the resin of the protrusion 142 is damaged. It is possible to manufacture the airbag lid reinforcing member 31 in which the occurrence of the airbag lid hardly occurs.

  Also, by holding the hinge member 54 in the pressed state by the protrusion 148 in the molding space 102, the position of the hinge member 54 in the leg 34, the depth of the recess 143, the buried shape, and the like can be controlled. Therefore, for example, the embedding angle 144 of the hinge member 54 can be set to an obtuse angle.

  (Effect 8) According to the method of manufacturing the air backgrid reinforcing member 31, the same operation and effect as described above can be obtained.

Reference Signs List 31 air back grid reinforcing member 32 door portion 33 flange portion 34 leg portion 35 hinge portion 37a welding rib 52 extra length portion 54 hinge member 54a root portion 101 manufacturing mold device 102 molding space 103 mold 104 mold 141 top surface 142 protrusion 143 recess 143a bottom 144 burying angle 145 bridge 146 position 147 projecting part 148 projecting part X vehicle longitudinal direction Y vehicle width direction Z vertical direction

Claims (8)

At least a door portion and a leg portion located outside the door portion,
In the airbag lid reinforcing member connected between the opposed portions of the door portion and the leg portion by embedding a hinge member formed of a separate member,
A protrusion is formed on the portion of the leg facing the door, the protrusion protruding from the upper surface of the leg toward the door.
A root portion of the hinge member with respect to the leg portion is buried in a state of being exposed on a surface layer of the protrusion,
An airbag lid reinforcing member, wherein a concave portion is formed on the upper surface of the leg portion at a position outside the projecting portion. The airbag lid reinforcing member according to claim 1,
The airbag lid reinforcing member, wherein the concave portion has a bottom portion that reaches a depth at which the hinge member is embedded in the leg portion. The airbag lid reinforcing member according to claim 1 or 2,
The embedding angle of the hinge member with respect to the leg portion is obtuse. The airbag lid reinforcing member according to any one of claims 1 to 3,
The hinge member embedded in the leg is bent downward such that the bottom of the concave portion is located at the lowest point. The airbag lid reinforcing member according to any one of claims 1 to 4,
The recess is provided discontinuously in the width direction of the leg,
A bridge member reaching the upper surface of the leg portion is formed between the concave portions. The airbag lid reinforcing member according to any one of claims 1 to 5,
The airbag lid reinforcing member, wherein the recess is formed at a position between an inner surface of the leg and a welding rib closest to the door formed on an upper surface of the leg. At least a door portion and a leg portion located outside the door portion,
For manufacturing an airbag grid reinforcing member having a molding space for manufacturing an airbag grid reinforcing member that is connected by embedding a hinge member formed of a separate member between opposed portions of the door portion and the leg portion. In the mold equipment,
A projecting portion is formed on the portion of the leg portion facing the door portion so as to project toward the door portion from an upper surface of the leg portion, and a root portion of the hinge member with respect to the leg portion is formed by the projecting portion. With a protruding part forming part to be embedded in a state exposed on the surface layer of
A mold device for manufacturing an airbag lid reinforcing member, comprising: a projection for forming a concave portion on the upper surface of the leg portion outside the projecting portion. At least a door portion and a leg portion located outside the door portion,
A method of manufacturing an airbag grid reinforcing member for manufacturing an airbag grid reinforcing member connected by embedding a hinge member formed of a separate member between the opposed portions of the door portion and the leg portion,
A projecting portion is formed on the portion of the leg portion facing the door portion, the projecting portion projecting toward the door portion from an upper surface of the leg portion, and a root portion of the hinge member with respect to the leg portion is formed as the projecting portion. Buried in a state exposed on the surface layer of
A method for manufacturing an airbag lid reinforcing member, wherein a concave portion is formed on the upper surface of the leg portion at a position outside the projecting portion.